I've heard it was entirely the decision of his agent, Drew Rosenhaus. Rosenhaus is one of the very best agents in the business. It was suggested it would serve a dual purpose. One, it could weed out teams that were simply curious, but not serious, which would be a waste of time. Two, it could bring to light teams that are considering moving into the top 10. Those teams not currently in the top 10 can still approach Rosenhaus with the idea that they may make a move if they can.